Class 6 Geography

WBBSE Class 6 Geography Chapter 8 Air Pollution Multiple Choice Question And Answers

Question 1. Which of the following in the atmosphere protects life on Earth from the harmful ultraviolet rays of the sun?

1. O₂
2. O₃
3. H_2O

Answer: 2. O₂

Question 2. Refrigerators, air conditioners and aerosol sprays release –

1. O₂
2. CFC
3. SO₂

Answer: 2. CFC

Question 3. The thinning of the ozone layer will allow which rays to reach the earth?

1. Ultraviolet rays
2. X rays
3. Infrared rays

Answer: 1. Ultraviolet rays

Read and Learn More WBBSE Class 6 Geography Multiple Choice Questions

Question 4. Which gas emitted from supersonic jets causes harm to the ozone layer?

1. Nitrogen oxide
2. Hydrogen
3. Carbon dioxide

Answer: 1. Nitrogen oxide

WBBSE Class 6 Geography Question Answer

Question 5. Skin cancer is caused by—

1. Noise pollution
2. Air pollution
3. Soil pollution

Answer: 2. Air pollution

Question 6. Monuments made of marble such as taj mahal and victoria memorial are getting damaged due to—

1. Acid rain
2. Depletion of the ozone layer
3. Global warming

Answer: 1. Acid rain

Question 7. Acid rain is more common in—

1. Industrial areas
2. Forests
3. Farmlands

Answer: 1. Industrial areas

Question 8. Which of the following gets mixed with water during acid rain?

1. Sulphur dioxide
2. Calcium carbonate
3. Chlorofluorocarbon

Answer: 1. Sulphur dioxide

Question 9. The glass structures used to cultivate vegetables and other plants in cold countries are known as—

1. Winter houses
2. Greenhouses
3. Glasshouses

Answer: 2. Greenhouses

Question 10. Which of the following is a greenhouse gas?

1. Methane
2. Oxygen
3. Hydrogen

Answer: 1. Methane

WBBSE Class 6 Geography Question Answer

Question 11. Which of the following gases is responsible for global warming?

1. Oxygen
2. Nitrogen
3. Carbon dioxide

Answer: 3. Carbon dioxide

Question 12. Which of the following is a form of public transport?

1. Bicycle
2. Rickshaw
3. Train

Answer: 3. Train

Question 13. Which of the following modes of transport does not cause air pollution?

1. Bus
2. Diesel train
3. Electric train

Answer: 3. Electric train

Question 14. The use of alternative energy will help to—

1. Lower the level of air pollution
2. Raise the level of air pollution
3. Maintain the level of air pollution

Answer: 1. Maintain the level of air pollution

Question 15. The source of alternative energy is—

1. Hydroelectricity
2. Heat electricity
3. Solar power

Answer: 3. Solar power

Question 16. The intensity of air pollution is maximum—

1. In dense forests
2. In mountain peaks
3. Near the ground surface

Answer: 3. Near the ground surface

WBBSE Class 6 Geography Chapter 8 Air Pollution Multiple Choice Question And Answers

Question 1. When We Breathe In, What Do We Take In From The Air?

1. O₂
2. CO₂
3. NO₂

Answer: 1. O₂

Question 2. When We Breathe Out, What Do We Release Into The Air?

1. O₂
2. CO₂
3. NO₂

Answer: 2. CO₂

Question 3. Which Of The Following Is A Toxic Gas Present In The Air?

1. NO₂
2. O₂
3. H₂

Answer: 1. NO₂

Question 4. One Of The Causes Of Air Pollution Is—

1. Afforestation
2. Industrialization
3. Grazing Of Animals

Answer: 2. Industrialisation

Question 5. Which Of The Following Is A Potential Cause Of Air Pollution?

1. Population Growth
2. Planned Urbanisation
3. Afforestation

Answer: 1. Population Growth

Question 6. When We Cut Down Trees And Forests, The Percentage Of Which Gas In The Air Increases?

1. O₂
2. CO₂
3. NO₂

Answer: 2. CO₂

Question 7. An Example Of A Toxic Air Pollutant Is—

1. Oxygen
2. Carbon Monoxide
3. Nitrogen

Answer: 2. Carbon Monoxide

Question 8. Which Of The Following Is A Toxic Metal Substance That Is Released From Vehicular Smoke?

1. Mercury
2. Lead
3. Cadmium

Answer: 2. Lead

Question 9. Indoor Air Pollution Is Mainly Caused Due To—

1. Accumulation Of Wastes
2. Deforestation
3. Applying Paints On Walls

Answer: 3. Applying Paints On Walls

Question 10. Which Of The Following Is Used As A Fuel For Aeroplanes?

1. LPG
2. Diesel
3. Gasoline

Answer: 3. Gasoline

Question 11. Asthma Attacks Are Triggered By—

1. Water Pollution
2. Soil Pollution
3. Air Pollution

Answer: 3. Air Pollution

WBBSE Class 6 Geography Chapter 8 Air Pollution Notes

1. When air is polluted by different poisonous gases, chemical substances, smoke from vehicles, dust particles, and organic compounds, it causes air pollution.

2. Air pollutants are those harmful organic and inorganic substances that pollute the air.

3. The layer of ozone gas present in the upper reaches of the stratosphere is known as the ozone layer.

4. Different toxic gases (such as carbon dioxide, oxides of nitrogen, and sulfur dioxide) react with rainwater and fall upon the earth as acid rain.

5. Greenhouse is an artificial chamber made of glass and is used to cultivate vegetables and flowers in regions having a cold climate.

This glass absorbs sunlight and does not allow the heat to move out of the chamber, thereby maintaining a high temperature in the chamber.

As a result, the inner environment of the chamber remains warm and is conducive to plant growth in such climatic regions.

Read and Learn More WBBSE Class 6 Geography Notes

6. Carbon dioxide, methane, nitrous oxide, CFCs, and ozone are some examples of greenhouse gases. The presence of these gases increases the temperature of the atmosphere manifold.

7. During the daytime heat from the Sun reaches the Earth which returns to space during the night.

However, greenhouse gases like carbon dioxide, methane, nitrous oxide, and water vapor present in the air absorb some amount of this heat and radiate it back to the Earth’s atmosphere.

This leads to a rise in the temperature of the atmosphere and this phenomenon is known as global warming.

WBBSE Solutions For Class 6 Geography	WBBSE Solutions For Class 6 History	WBBSE Solutions For Class 6 Maths
WBBSE Class 6 Geography Notes	WBBSE Class 6 History Notes	WBBSE Solutions For Class 6 School Science
WBBSE Class 6 Geography Multiple Choice Questions	WBBSE Class 6 History MCQs	WBBSE Notes For Class 6 School Science

 

8. The mode of transport by which a large number of people can travel from one place to another is called mass transport or public transport such as buses, trains, trams, etc.

WBBSE Class 6 Air Pollution Notes

9. In 2007, on 31 March the residents of Sydney in Australia switched off all the lights in the city for one hour (8.00 pm-9.00 pm) to reduce the impact of global warming.

At present, citizens of almost 1000 cities in 85 countries switch off lights for one hour every year on a day in the last week of March and this is termed Earth Hour.

10. Every year 22 April is celebrated as Earth Day all over the world to create awareness among people about protecting the environment.

WBBSE Class 6 Geography Chapter 7 Weather and Climate Introduction

1. Weather refers to the atmospheric conditions (air temperature, precipitation, humidity, pressure, wind, cloudiness) of a particular place at a given point in time.

2. Climate is defined as the average weather conditions of a greater extent of the area over a long period of time, say 30-35 years.

3. Only 1 in 20 billion parts of sunlight reaches the Earth. This is known as incoming solar radiation or insolation.

4. Only 51% of the insolation heats the Earth’s surface. This is called effective solar radiation.

5. About 35% of the insolation is reflected back to outer space by clouds, dust particles, and water vapour without heating the Earth’s surface. This is called the albedo.

Read and Learn More WBBSE Class 6 Geography Notes

6. At night, almost 51% of the insolation which heats up the Earth’s surface during the day, radiates back to the atmosphere or space from the Earth’s surface. This is terrestrial radiation.

7. The process of heat transfer from the Sun, directly to the Earth’s surface and back to the atmosphere again, is called radiation.

8. The process by which heat energy is transferred from a warmer surface to some other cooler surface is called conduction. The incoming solar radiation heats up the Earth’s surface.

WBBSE Solutions For Class 6 Geography	WBBSE Solutions For Class 6 History	WBBSE Solutions For Class 6 Maths
WBBSE Class 6 Geography Notes	WBBSE Class 6 History Notes	WBBSE Solutions For Class 6 School Science
WBBSE Class 6 Geography Multiple Choice Questions	WBBSE Class 6 History MCQs	WBBSE Notes For Class 6 School Science

 

Thus, the lowest strata of air close to the Earth’s surface get heated up first. This warm air rises upwards and the cool air above settles downwards to take its place.

This cool air then gets similarly heated up and moves upwards. The process of heat transfer through the movement of air currents is known as convection.

WBBSE Class 6 Elements of Weather Notes

9. The incoming solar radiation heats up the Earth’s surface. Thus, the lowest strata of air close to the Earth’s surface get heated up first. This warm air rises upwards and the cool air above settles downwards to take its

10. Heat is an energy that can warm up any object and temperature is the measure of heat.

Class 6 Geography WBBSE

11. The difference between the maximum and the minimum temperature of any place in a day is called the diurnal range of temperature.

12. The difference between the average temperature of the coldest month and the hottest month in a year is known as the annual range of temperature.

13. The water vapour content in a particular volume of air in a place, at a particular temperature is known as the humidity of that air.

14. The pressure exerted by the air on the Earth’s surface is called air pressure.

15. The horizontal movement of air is known as the wind or airflow.

16. The measurable proportion of clouds in the sky is called cloud cover or cloudiness.

17. The moisture-laden air being light moves upwards. The temperature and air above is less and thus the moisture cools down and turns into little droplets of water. This is the process of condensation.

18. Water vapour in the air condenses around dust particles to form tiny water droplets which collectively form clouds.

Small water droplets merge with each other and become heavy droplets. These water droplets then fall as rain on the Earth’s surface under the influence of gravity.

19. The angle at which sunlight strikes the Earth’s surface is called the angle of incidence of sunlight on Earth.

20. Isotherms are imaginary lines on the Earth’s surface that connect all points on a map with equal temperatures.

21. The temperature decreases gradually from the Earth to the poles due to the difference in the angle of incidence of sunlight.

The division of the Earth into three belts on the basis of the amount of heat received from the Sun is called the heat belts.

22. The region between the Tropic of Cancer and the Tropic of Capricorn on either side of the Equator is known as Torrid Zone.

23. The regions from the Tropic of Cancer to the Arctic Circle and from the Tropic of Capricorn to the Antarctic Circle in the northern and southern hemispheres respectively are known as Temperate Zones.

24. The regions from the Arctic Circle to the North Pole in the northern hemisphere and from the Antarctic Circle to the South Pole in the southern hemisphere are known as the Frigid Zones.

WBBSE Class 6 Geography Chapter 7 Weather And Climate Topic A Elements Of Weather And Climate Multiple Choice Questions

Question 1. The average weather condition at any place over a period of years is called its climate.

1. 30-35
2. 25-30
3. 20-25

Answer: 1. 30-35

Question 2. The earth receives only 1 in billion parts of the sun’s light and heat.

1. 10
2. 20
3. 30

Answer: 2. 20

Question 3. The main source of heat in the atmosphere is the—

1. Sun’s rays
2. Volcanoes
3. Waterbodies

Answer: 1. Sun’s rays

Question 4. Only % of the sun’s rays heat the earth’s surface.

1. 49
2. 51
3. 35

Answer: 2. 51

Read and Learn More WBBSE Class 6 Geography Multiple Choice Questions

Question 5. The average overall albedo of the earth is—

1. 35%
2. 51%
3. 49%

Answer: 1. 35%

Question 6. The amount of terrestrial radiation is—

1. 35%
2. 51%
3. 49%

Answer: 2. 51%

Question 7. The instrument used to measure atmospheric temperature is the—

1. Barometer
2. Thermometer
3. Hygrometer

Answer: 2. Thermometer

Question 8. Temperature is the measure of—

1. Humidity
2. Pressure
3. Heat 19

Answer: 3. Heat 19

Question 9. The freezing point of water on the Fahrenheit scale is—

1. 0° F
2. 32°F
3. 212°F

Answer: 2. 32°F

Question 10. The instrument used to measure atmospheric humidity is the—

1. Thermometer
2. Barometer
3. Hygrometer

Answer: 3. Hygrometer

Question 1. The instrument used to measure atmospheric pressure is the—

1. Thermometer
2. Nanometer
3. Fortin’s barometer

Answer: 3. Fortin’s barometer

Question 2. In winter, atmospheric pressure is—

1. Higher
2. Lower
3. The same

Answer: 1. Higher

Question 3. The instrument used to measure wind speed is the—

1. Nanometer
2. Anemometer
3. Barometer

Answer: 2. Anemometer

Question 4. The instrument used to measure wind direction is the—

1. Rain gauge
2. Anemometer
3. Wind vane

Answer: 3. Wind vane

Question 5. The process by which water vapour cools and changes its physical state to water droplets is called

1. Condensation
2. Evaporation
3. Precipitation

Answer: 1. Condensation

Question 6. Rainfall, snowfall, hail, drizzle and sleet are all forms of—

1. Precipitation
2. Cyclone
3. High atmospheric pressure

Answer: 1. Precipitation

Question 7. The instrument used to measure the amount of rainfall is the—

1. Wind vane
2. Rain gauge
3. Barometer

Answer: 2. Rain gauge

Question 8. The headquarter of the West Bengal weather department is in—

1. Alipore
2. Cossipore
3. Santoshpur

Answer: 1. Alipore

Question 9. The range of temperature in places with similar weather conditions is—

1. More
2. Less
3. Similar

Answer: 2. Less

Question 10. For every 1000 metres increase in altitude, the temperature decreases by—

1. 9.4°c
2. 6.5°c
3. 5.8°c

Answer: 2. 6.5°c

Question 11. For every 165 metres increase in altitude, the temperature decreases almost—

1. 8°C
2. 1°C
3. 9°C

Answer: 2. 1°C

Question 12. An imaginary line connecting all points on the earth with the same atmospheric temperature is called an—

1. Isobar
2. Isohyet
3. Isotherm

Answer: 3. Isotherm

Question 13. The total number of heat belts on the earth is—

1. 4
2. 2
3. 3

Answer: 3. 3

Question 14. The region between 30°-60° latitude in both hemispheres is known as the—

1. Torrid zone
2. Temperate zone
3. Frigid zone

Answer: 2. Temperate zone

Question 15. Ladakh is a—

1. Hot Desert
2. Cold desert
3. High-rainfall zone

Answer: 2. Cold desert

WBBSE Class 6 Geography Chapter 6 The Ice-Capped Continent Multiple Choice Questions

Question 1. Man first came to know about the ice-covered continent in the year—

1. 1820
2. 1920
3. 1980

Answer: 1. 1820

Question 2. The Greek word ‘Antarctica’ means-

1. The opposite of the south
2. The opposite of the north
3. The opposite of continent

Answer: 2. The opposite to the north

Question 3. Antarctica is located near the—

1. South pole
2. North pole
3. Equator

Answer: 1. South pole

Read and Learn More WBBSE Class 6 Geography Multiple Choice Questions

Question 4. Antarctica is bounded by—

1. Pacific Ocean
2. Atlantic ocean
3. Antarctic ocean

Answer: 3. Antarctic ocean

Question 5. Antarctica is the world’s continent.

1. Second-largest
2. Fourth-largest
3. Fifth-la largest

Answer: 1. Second-largest

Question 6. The area of Antarctica is equal to that of Australia—

1. Thrice
2. Twice
3. Four times

Answer: 2. Twice

Question 7. Antarctica is known as the—

1. White continent
2. Green continent
3. Dark continent

Answer: 1. White continent

Question 8. Erebus on ross island in the Antarctic is a volcano that is—

1. Active
2. Extinct
3. Dormant

Answer: 1. Active

Question 9. Antarctica is the world’s longest—

1. Mountain glacier
2. Continental glacier
3. Piedmont glacier

Answer: 2. Continental glacier

Question 10. In Antarctica, it is continuous day for—

1. 12 Months
2. 6 Months
3. 3 Months

Answer: 2. 6 Months

Question 11. The coldest, uninhabited place on earth is—

1. Oymyako
2. Verkhoyansk
3. Vostok

Answer: 3. Vostok

Question 12. Antarctica is divided into two parts by the—

1. Ross and Weddell seas
2. Trans-Antarctic mountains
3. Prime meridian

Answer: 2. Trans-Antarctic mountains

Question 13. The longest and the largest continental glacier in the world is—

1. Hubbard
2. Lambert
3. Siachen

Answer: 2. Lambert

Question 14. Antarctica is a continent that is—

1. Uninhabited
2. Sparsely populated
3. Moderately populated

Answer: 1. Uninhabited

Question 15. The bird associated with Antarctica is—

1. Peacock
2. Pigeon
3. Penguin

Answer: 3. Penguin

Question 16. The first person to set foot on the south pole was—

1. James cook
2. Roald Amundsen
3. John Davis

Answer: 2. Roald Amundsen

Question 17. The number of research stations in Antarctica is near—

1. 70
2. 50
3. 100

Answer: 3. 100

Question 18. India’s first research station in Antarctica was—

1. Maitree
2. Vostok
3. Dakshin Gangotri

Answer: 3. Dakshin Gangotri

WBBSE Class 6 Geography Class 6 Geography Chapter 6 The Ice-Capped Continent Introduction

1. Antarctica remains perpetually covered under a 1-2km layer of snow and compacted ice. Thus, it is called the White Continent and is also depicted on maps in white colour.

2. There are huge glaciers in Antarctica. The Lambert Glacier is the longest glacier in the world.

3. Blizzards are violent snowstorms which blow at a speed of over 72 km/h for usually three hours or more.

4. In Antarctica, it is continuously night from May to August. During this time, the rainbow-like natural light display can be seen in the night sky.

This natural colourful light display is known as Aurora or Polar Lights in general and Aurora Australis in particular.

Read and Learn More WBBSE Class 6 Geography Notes

5. The only permanent inhabitant of the continent of Antarctica is the Penguins. Although they are birds, they can not fly but can swim very well. Fishes and krills are the main food of these penguins.

6. Krills are small shrimp-like fishes found in the seas adjacent to Antarctica.

WBBSE Solutions For Class 6 Geography	WBBSE Solutions For Class 6 History	WBBSE Solutions For Class 6 Maths
WBBSE Class 6 Geography Notes	WBBSE Class 6 History Notes	WBBSE Solutions For Class 6 School Science
WBBSE Class 6 Geography Multiple Choice Questions	WBBSE Class 6 History MCQs	WBBSE Notes For Class 6 School Science

 

7. Dakshin Gangotri is India’s first research station in Antarctica. The first team of Indian explorers reached Antarctica on 9 January 1982 and set up this station.

8. The eighth team of Indian explorers established India’s second permanent research station, Maitree, 70 km away from the Dakshin Gangotri on 26th March 1988.

WBBSE Chapter 5 Water Land Air Multiple Choice Questions

Question 1. The blanket of air that surrounds the earth and extends up to almost 10000 km above the earth’s surface is called the—

1. Hydrosphere
2. Lithosphere
3. Atmosphere

Answer: 3. Atmosphere

Question 2. The main gaseous component of the atmosphere is—

1. Nitrogen
2. Oxygen
3. Carbon dioxide

Answer: 1. Nitrogen

Question 3. The percentage of nitrogen in the atmosphere is almost—

1. 20%
2. 78%
3. 3%

Answer: 2. 78%

Read and Learn More WBBSE Class 6 Geography Multiple Choice Questions

Question 4. The percentage of oxygen in the atmosphere is almost—

1. 21%
2. 78%
3. 3%

Answer: 1. 21%

Question 5. The main gaseous constituent of the atmospheric layer i.e. Available 20 km-25 km above the earth’s surface is—

1. O₂
2. O₃
3. NO₂

Answer: 2. O₃

Question 6. The layer of the atmosphere that extends up to 16km above the earth’s surface is called the—

1. Troposphere
2. Stratosphere
3. Mesosphere

Answer: 1. Troposphere

Question 7. The layer that sees an abundance of weather phenomena, like storms and rain is the—

1. Troposphere
2. Stratosphere
3. Mesosphere

Answer: 1. Troposphere

Question 8. Harmful ultraviolet rays are absorbed in the—

1. Mesosphere
2. Ozonosphere
3. Exosphere

Answer: 2. Ozonosphere

Question 9. Jet planes travel through—

1. Ozonosphere
2. Stratosphere
3. Mesosphere

Answer: 2. Stratosphere

Question 10. The layer that reflects radio waves back towards the earth’s surface is the—

1. Ionosphere
2. Mesosphere
3. Exosphere

Answer: 1. Ionosphere

Question 11. The number of meteors that rush towards the earth every day is—

1. 10 Billion
2. 150 Billion
3. 200 Billion

Answer: 1. 10 Billion

Question 12. The thin, hard outermost layer of the earth is called the—

1. Core
2. Crust
3. Mantle

Answer: 2. Core

Question 13. The innermost layer of the earth is—

1. Crust
2. Core
3. Mantle

Answer: 2. Core

Question 14. Life on earth first originated—

1. On land
2. In air
3. In water

Answer: 3. In water

Question 15. The drift of the continents from their previous position is called the—

1. Continental drift
2. Continental shift
3. Continental movement

Answer: 1. Continental drift

Question 16. About 270 million years ago, there was only one landmass or supercontinent on the earth and this was called—

1. Pangaea
2. Panthalassa
3. Geosyncline

Answer: 2. Pangaea

Question 17. Is the world’s largest continent.

1. Europe
2. Asia
3. Africa

Answer: 2. Asia

Question 18. The continent where the temperature is always at or below the freezing point is—

1. North America
2. South America
3. Antarctica

Answer: 3. Antarctica

Question 19. Is the world’s smallest continent.

1. Asia
2. Oceania
3. Africa

Answer: 2. Oceania

Question 20. The largest ocean in the world is—

1. Pacific Ocean
2. Atlantic ocean
3. Indian Ocean

Answer: 1. Pacific Ocean

Question 21. The smallest ocean on earth is—

1. Arctic Ocean
2. Antarctic ocean
3. Indian Ocean

Answer: 1. Antarctic ocean

Question 22. The highest mountain on earth is—

1. Everest
2. Aconcagua
3. Kilimanjaro

Answer: 1. Everest

Question 23. The longest mountain range on earth is the—

1. Himalayas
2. Andes
3. Alps

Answer: 2. Andes

Question 24. The longest river in the world is—

1. Amazon
2. Nile
3. Mississippi

Answer: 2. Nile

Question 25. The largest river in the world in terms of area is—

1. Amazon
2. Nile
3. Mississippi

Answer: 1. Amazon

Question 26. The fourth largest river system in the world is—

1. The ganga-brahmaputra
2. The Mississippi-Missouri
3. The rhine-ruhr

Answer: 2. The Mississippi-Missouri

Question 27. The southern hemisphere has more water than the northern hemisphere.

1. 10%
2. 15%
3. 75%

Answer: 2. 15%

WBBSE Class 6 Geography Chapter 5 Water Land Air Introduction

1. The blanket of air that envelopes the Earth and is held close to it because of the Earth’s gravitational force is called the Atmosphere. The atmosphere extends up to a height of 10000km to 15000 km above the Earth’s surface.

2. The lowest layer of the atmosphere extending up to 16km above the Earth’s surface, is known as the Troposphere.

3. The next layer after the troposphere up to a height of 50 km from the Earth’s surface is known as the Stratosphere.

4. The layer, above the stratosphere up to a height of 80 km from the Earth’s surface is known as the Mesosphere.

5. Above the mesosphere till 300 km from the Earth’s surface is the Thermosphere. Air becomes very thin in this layer. Gases in this layer are in an ionized state. So this layer is also known as the Ionosphere.

6. The outermost layer of the atmosphere, above the thermosphere where artificial satellites and space stations are located, is known as the Exosphere.

Read and Learn More WBBSE Class 6 Geography Notes

7. The solid and thin outermost layer of the Earth is called the Crust.

8. The concentric layer in between the crust and the core is known as the Mantle.

9. The innermost layer; after the mantle around the center of the Earth, is known as the Core.

WBBSE Solutions For Class 6 Geography	WBBSE Solutions For Class 6 History	WBBSE Solutions For Class 6 Maths
WBBSE Class 6 Geography Notes	WBBSE Class 6 History Notes	WBBSE Solutions For Class 6 School Science
WBBSE Class 6 Geography Multiple Choice Questions	WBBSE Class 6 History MCQs	WBBSE Notes For Class 6 School Science

 

10. The solid landmass, made up of mostly rocks and soil is known as the Lithosphere. It forms only one-quarter of the Earth’s surface.

11. The total water content of the Earth in liquid, vapour or solid form together form the Hydrosphere.

12. Three-fourths of the Earth’s surface is water. No other planet in the solar system contains water to such a great extent. Thus, Earth appears blue from space and is called the Blue planet.

WBBSE Class 6 Earth Atmosphere Notes

13. The cyclic movement of water through solid, liquid and gaseous states from the Earth’s surface to the air and back on Earth is known as the Water cycle or the Hydrological cycle.

14. The movement of continents on the Earth’s surface under the influence of the convection currents generated in the magma present in the Earth’s interior is known as Continental drift.

15. Around 200 million years ago, there was only one unified continent or supercontinent. It was known as the Pangaea or, Pangea.

16. Pangaea was surrounded by a huge water mass or super ocean, known as the Panthalassa.

17. Difference in temperature in the Earth’s interior generates currents, known as Convention currents.

18. Land, water and air on Earth together create an environment that can support and sustain life. This region of the Earth occupied by living organisms is called the Biosphere. The numbers of plant and animal species in the biosphere are almost 35 thousand and 1.5 million respectively,

19. Human beings, an important part of the biosphere, interact with the environment. The more negative activities of human beings on the environment, the higher the degree of degradation of the environment.

20. The increase in the average temperature of the Earth’s atmosphere because of the heat trapped by the greenhouse gases in the air is called global warming.

Burning of fossil fuels and emissions from the factories lead to an increase of greenhouse gases (CO₂, CH₄, NO₂ etc.) in the atmosphere.

WBBSE Class 6 Geography Chapter 4 Rotation of the Earth  Introduction

1. Since the Earth spins in a west-to-east direction, the Sun seems to rise in the east and set in the west every day. This is known as the Sun’s apparent daily motion or movement.

2. The Earth spins on its axis tilted at an angle of 66V20 to the orbital plane in a west-to-east direction. This is known as the rotation of the Earth.

3. The circle that divides the Earth into a lit half and a dark half is called the circle of illumination or shadow circle. The lighted half of the Earth experiences day and the dark half experiences night.

4. The transitional time immediately before sunrise is called dawn and that immediately after sunset and before the evening is called dusk.

5. The Earth pulls everything towards its center. This tension is known as gravity.

Read and Learn More WBBSE Class 6 Geography Notes

6. The International Date Line is an imaginary line that follows the 180° longitude mostly, except in a few places.

7. When the Sun remains overhead on a particular meridian, it is 12 noon at all places on the same meridian. That is why lines of longitudes are known as meridians.

8. The time of a place that is calculated from 12 noon is known as the local time of that place.

9. A meridian that passes through the middle of a country is considered as the standard meridian of that country. And the local time of that meridian is considered the standard time of that country.

WBBSE Solutions For Class 6 Geography	WBBSE Solutions For Class 6 History	WBBSE Solutions For Class 6 Maths
WBBSE Class 6 Geography Notes	WBBSE Class 6 History Notes	WBBSE Solutions For Class 6 School Science
WBBSE Class 6 Geography Multiple Choice Questions	WBBSE Class 6 History MCQs	WBBSE Notes For Class 6 School Science

 

10. The local time of 82°30 ‘E meridian has been taken as the Indian Standard Time (1ST).

11. Ante Meridian (am) is the period of time between 12 midnight and noon.

12 Similarly, the time between 12 noon and before 12 midnight is called Post Meridian (pm)

WBBSE Class 6 Geography Chapter 4 Rotation Of The Earth Topic A Rotation Of The Earth And Day-Night Multiple Choice Questions

Question 1. The sun rises in the east and sets in the west every day; this is-

1. The sun’s apparent daily motion
2. The earth’s apparent daily motion
3. The sun’s apparent yearly motion

Answer: 1. The sun’s apparent daily motion

Question 2. The fact that the sun and not the earth is at the center of the solar system was first proved by—

1. Ptolemy
2. Eratosthenes
3. Copernicus

Answer: 3. Copernicus

Question 3. Copernicus was a—

1. Greek astronomer
2. Roman astronomer
3. Polish astronomer

Answer: 3. Polish astronomer

Read and Learn More WBBSE Class 6 Geography Multiple Choice Questions

Question 4. The earth spins on its axis in a west-to-east direction. This is called its—

1. Rotation
2. Revolution
3. Apparent motion

Answer: 1. Rotation

Question 5. The earth rotates from—

1. East to west
2. West to east
3. North to south

Answer: 2. West to east

Question 6. The speed of rotation of the earth is maximum at the—

1. Tropic of cancer
2. Arctic circle
3. Equator
4. South pole

Answer: 3. Equator

Question 7. At the equator, the earth rotates at a speed of—

1. 1,650 Km/hour
2. 1,550 Km/hour
3. 1,450 Km/hour

Answer: 1. 1,650 Km/hour

Question 8. The circle that divides the day from night on the globe is called—

1. The equator
2. The great circle
3. The circle of illumination

Answer: 3. The circle of illumination

Question 9. The reason why we do not fall off the earth though it is in constant motion is its—

1. Gravitational force
2. Centrifugal force
3. Centripetal force

Answer: 1. Gravitational force

Question 10. The time of day when shadows are longest is—

1. Dawn
2. Noon
3. Afternoon

Answer: 3. Afternoon

Question 11. If we divide one hour into 60 equal parts, we get—

1. 1 Minute
2. 1 Second
3. 1 Microsecond

Answer: 1. 1 Minute

Question 12. In Australia, Christmas is celebrated in—

1. Summer
2. Winter
3. Monsoon

Answer: 1. Summer

Question 13. When it is 12 midnight on 1 January in Australia, in the USA it is—

1. 31 December evening
2. 31 December morning
3. 1 January night

Answer: 2. 31 December morning

Question 14. New year in India is celebrated in—

1. Summer
2. Winter
3. Monsoon

Answer: 2. Winter

Question 15. The international date line is the—

1. 0° Meridian
2. 90° Meridian
3. 180° Meridian

Answer: 3. 180° Meridian

Question 16. Local time is calculated according to the—

1. 12 Noon at the location
2. 12 Midnight at the location
3. Morning 6 o’clock at the location

Answer: 1. 12 Noon at the location

Question 17. The term ‘meridian’ comes from—

1. Latin word
2. Greek word
3. German word

Answer: 1. Latin word

Question 18. The meridian passing through the middle of the geographical boundary of a country is called its—

1. Local meridian
2. Standard meridian
3. Mean meridian

Answer: 2. Standard meridian

Question 19. The standard meridian passing through India is—

1. 88°30’E
2. 82°30’E
3. 77°12’E

Answer: 2. 82°30’E

Question 20. India’s standard time is calculated according to the line of longitude passing through—

1. Kolkata
2. Allahabad
3. Delhi

Answer: 2. Allahabad

Question 21. If the railway station clock reads 20:00 hours, it means—

1. Morning 8 o’clock
2. Evening 8 o’clock
3. Morning 10 o’clock

Answer: 2. Evening 8 o’clock

Question 22. If it shows 00:00 hours on the airport time display, it is then—

1. 12 Noon
2. 12 Midnight
3. Morning 6 o’clock

Answer: 2. 12 Midnight

Question 23. From 12 midnight to 12 noon, the time period is called—

1. Post meridian
2. Ante meridian
3. Meridian

Answer: 2. Ante meridian